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<div class="iris_headline">IRIS Toolbox Reference Manual</div>




<h2 id="modellang/exogenousvariables">!exogenous_variables</h2>
<div class="headline">List of exogenous variables</div>

<h4 id="syntax">Syntax</h4>
<pre><code>!exogenous_variables
    VariableName, VariableName, ...
    ...</code></pre>
<h4 id="syntax-with-descriptors">Syntax with descriptors</h4>
<pre><code>!exogenous_variables
    VariableName, VariableName, ...
    &#39;Description of the variable...&#39; VariableName</code></pre>
<h4 id="syntax-with-steady-state-values">Syntax with steady-state values</h4>
<pre><code>!exogenous_variables
    VariableName, VariableName, ...
    VariableName = Value</code></pre>
<h4 id="description">Description</h4>
<p>The <code>!exogenous_variables</code> keyword starts a new declaration block for exogenous variables, i.e. variables that can appear only in <a href="../modellang/dtrends.html"><code>!dtrends</code></a> equations. The names of the variables must be separated by commas, semi-colons, or line breaks. You can have as many declaration blocks as you wish in any order in your model file: They all get combined together when you read the model file in. Each variable must be declared (exactly once).</p>
<p>You can add descriptors to the variables (enclosed in single or double quotes, preceding the name of the variable); these will be stored in, and accessible from, the model object. You can also assign steady-state values to the variables straight in the model file (following an equal sign after the name of the variable); this is, though, rather rare and unnecessary practice because you can assign and change steady-state values more conveniently in the model object.</p>
<h4 id="example">Example</h4>
<pre><code>!exogenous_variables
    X, &#39;Tax effects&#39; Y
    &#39;Population growth effects&#39; Z = 0 + 0.5i;</code></pre>

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<div class="copyright">IRIS Toolbox. Copyright &copy; 2007-2015 IRIS Solutions Team.</div>
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